LM339ADR2 - Quad 18V/36V Comparator | ON Semiconductor | SOIC-14
MPN： LM339ADR2 ✓ 啟用中LM339ADR2 概覽
A voltage comparator is an analog mixed-signal semiconductor that compares an input voltage with a reference voltage and produces a logic-level indication of their relationship. Quad comparators belong to the broader comparator and amplifier IC hierarchy, where they are used for threshold detection, overvoltage and undervoltage monitoring, signal conditioning, and control-system decision making. Their open-collector-style outputs are commonly associated with flexible system-level interfacing, although the exact output configuration should be confirmed in the manufacturer datasheet.
The LM339ADR2's four-channel architecture gives designers independent comparator functions in one package. This can simplify analog front ends that compare a sensor signal against a configurable threshold, evaluate a feedback voltage, or supervise a system rail. The 14-pin SOIC package provides a conventional surface-mount footprint suitable for automated assembly, while tape-and-reel packaging supports standard production handling.
The LM339ADR2 family is associated with an 18 V/36 V comparator rating and single-supply operation. These figures make the device relevant to industrial, automotive-style, and embedded control systems where input voltages can exceed the common rail of many low-voltage comparators. Designers must still observe the exact common-mode, differential-input, supply-voltage, output-current, and absolute-maximum limits listed for this exact orderable device.
Typical uses include DC overvoltage detection, undervoltage supervision, window comparison, sensor thresholding, and industrial control interfaces. In these applications, each comparator can compare a monitored voltage against a reference, while an external pull-up may establish the digital output state when the comparator output is inactive. The comparator is especially useful when a system needs a simple, robust indication rather than a high-speed amplified analog signal.
For implementation, begin with the manufacturer's pin-description and electrical-characteristics tables, then connect input, output, ground, and supply pins exactly as specified. Keep sensitive reference and feedback traces short, place input and supply bypassing capacitors close to the device, and check whether the selected logic family and output pull-up arrangement satisfy the system requirements.
This page combines the verified manufacturer-oriented part listing, package information, comparison candidates, and practical integration guidance. It distinguishes documented facts from parameters that still require confirmation from the exact LM339ADR2 datasheet, helping engineers plan sourcing and schematic review without relying on a different package variant by mistake.
直接替換替代品，適用於 LM339ADR2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM339ADR2 （相同外形與佔位） — 差異在於 Package, Comparator Type, Input Offset Voltage, Output Type, Response Time.
LM239ADR
✅ 直接替換📋 參考替代品（不在目錄中）
LM339ADR2 最大額定值與電氣特性
| Product Type | Quad differential comparator |
| Number of Comparators | 4 channels |
| Supply Configuration | Single supply |
| Comparator Voltage Rating | 18 V/36 V |
| 封裝 | 14-pin SOIC |
| Packaging | Tape and reel |
| 安裝類型 | Surface mount |
LM339ADR2 14-pin soic 腳位配置指南
LM339ADR2（14-pin soic 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM339ADR2.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM339ADR2 適用於 6 應用s: Industrial Overvoltage Supervision, DC Power Rail Window Monitoring, Sensor Threshold Detection, Motor and Solenoid Control Interlocks, Battery Charger Status Detection, Control-System Logic Interface.
Industrial Overvoltage Supervision
The LM339ADR2 fits industrial overvoltage supervision because its four independent comparator channels can compare divided supply or signal voltages against references in a 14-pin SOIC package. Each channel provides a discrete threshold decision to a controller or relay logic rather than requiring four separate packages. The listed 18 V/36 V comparator association is relevant to industrial environments where monitored voltages can exceed low-voltage logic rails. Designers should verify the exact common-mode range, supply limits, output configuration, and response timing in the manufacturer datasheet before setting divider ratios or selecting external pull-up components.
推薦
DC Power Rail Window Monitoring
A four-channel LM339ADR2 can implement a multi-rail DC window monitor in an embedded or industrial control system. Two channels can detect upper and lower excursions on one rail, while additional channels monitor other supplies against local references. This arrangement reduces component count while keeping each threshold decision electrically independent. The single-supply architecture and documented 18 V/36 V comparator association make it especially relevant to higher-voltage monitoring domains. Resistor-divider values must keep every input inside the device's exact common-mode range, and the external output interface must match the logic system used by the supervisor.
推薦
Sensor Threshold Detection
The LM339ADR2 is appropriate for discrete sensor threshold detection where a temperature, pressure, or analog sensor output must be converted into an alarm or control decision. Two inputs on a channel provide the comparison between the conditioned sensor signal and a reference, while the quad configuration supports several independent thresholds or devices. Keeping the four channels in one 14-pin SOIC can simplify routing and reduce board area. The design should account for input offset, bias current, noise at the reference, and propagation delay; verify those parameters for the exact LM339ADR2 grade and temperature range before setting narrow alarm margins.
推薦
Motor and Solenoid Control Interlocks
The LM339ADR2 can support interlock decisions in motor-control and solenoid-driver boards by comparing feedback or supply-derived voltages with reference thresholds. A comparator channel can report an unsafe condition to a controller, while another can evaluate a command acknowledgment. Its quad arrangement allows several interlocks to share one package, and the 18 V/36 V comparator association is useful when sensing nodes exceed low-voltage logic levels. Because motor systems contain switching transients, the implementation must include suitable filtering and protection and must keep the measured voltages within the comparator's exact common-mode and differential-input limits.
推薦
Battery Charger Status Detection
The LM339ADR2 can implement threshold decisions for battery-pack or charger supervision by comparing scaled pack voltages with references. Separate channels can indicate undervoltage, overvoltage, charge-complete, or fault conditions, providing simple hardware decisions ahead of a controller. The single-supply comparator format and 18 V/36 V association align with applications where the sensed voltage may exceed a 5 V logic rail. The exact implementation still depends on the allowed supply range and input common-mode window, which must be confirmed from the exact device documentation. Divider tolerances, reference accuracy, and channel-to-channel behavior should be included in the safety analysis.
推薦
Control-System Logic Interface
The LM339ADR2 is useful in discrete control logic where an analog voltage must be translated into a digital decision for PLC, embedded, or instrumentation systems. Its four channels can compare process measurements, command feedback, or status signals against references, allowing one package to implement several conditional decisions. The 14-pin SOIC footprint supports conventional surface-mount assembly and keeps the analog routing compact. Designers must confirm the output topology and required pull-up arrangement, account for input offset and propagation delay, and protect comparator inputs from transients. The result is a simple comparator-based decision stage rather than a precision measurement system.
推薦
推薦產品摘要
工程參考資料，適用於 LM339ADR2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM239ADR | LM339ADR |
|---|---|---|---|
| Brand | ON Semiconductor | ON Semiconductor | Texas Instruments |
| Package | 14-SOIC | 14-SOIC | 14-SOIC |
| Comparator Configuration | Quad differential comparator | Quad comparator | Quad differential comparator |
| Comparator Voltage Rating | 18 V/36 V | 18 V to 36 V family association | 18 V/36 V association |
| Number of Channels | 4 channels | 4 channels | 4 channels |
主要差異化特點
- Direct ON Semiconductor family alignment (對比LM339ADR)
- Four independent channels in one package (對比LM2904P3)
- Single-supply quad monitoring in a standard surface-mount footprint (對比LM201AD)
設計說明
Do not treat the 18 V/36 V listing description as permission to apply any voltage in that range to every pin. Confirm the exact supply range, common-mode input range, differential-input limit, and absolute maximum ratings in the LM339ADR2 datasheet. In particular, keep input and output excursions within their own limits; a wide input-voltage capability does not permit exceeding the output or supply ratings.
Use the manufacturer 14-pin SOIC footprint and follow the documented pin numbering exactly. Place any input bypass capacitor and any components associated with reference or feedback nodes close to their corresponding pins to reduce trace pickup and propagation of switching noise. Keep comparator input traces away from high-current switching paths, and provide an uninterrupted ground reference close to the device.
For threshold sensing, calculate divider ratios so the worst-case input remains inside the comparator's common-mode range. Include reference tolerance, input offset, resistor tolerance, and temperature drift when determining the guaranteed switching threshold. If the selected output configuration requires a pull-up, calculate its maximum current with the output transistor fully on and choose a value that satisfies both the logic-high requirement and the device's output-current limit.
Decouple the supply pin locally with a bypass capacitor selected from the manufacturer recommendations, and account for comparator supply current in the upstream regulator budget. When monitoring a higher-voltage rail, use properly rated resistor dividers and verify their voltage and power dissipation under fault conditions. The comparator's 18 V/36 V family association must not replace the exact device's operating-limit check.
合規資訊
Compliance status was not stated in the product listings and remains unconfirmed. Qualification claims such as AEC-Q100 should not be inferred from the wide voltage rating or industrial suitability.